Wood samples (15 x 2 x 2 cm³) were treated with one copper/chrome/arsenic (CCA) and one copper/chrome/boron (CCB) preservative using the following concentrations - O, 3, 6, 10%. Treated samples of three reference wood species - Alstonia scholaris, Fagus sylvatica, Pinus sylvestris were supplied to all participants. Additional local species were chosen by participants and included in the test at their own test site. Values for preservative retention in all samples were noted. All samples were to be exposed for at least 7 years and examined for (a) marine borer attack after 6 and 12 months and yearly intervals thereafter, and (b) microbiological attack after 6 and 24 months' exposure.

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